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Multiple Emission of Phosphonium Fluorophores Harnessed by the Pathways of Photoinduced Counterion Migration.
Belyaev, Andrey; Su, Bo-Kang; Cheng, Yu-Hsuan; Liu, Zong-Ying; Khan, Nasrulla Majid; Karttunen, Antti J; Chou, Pi-Tai; Koshevoy, Igor O.
Afiliação
  • Belyaev A; Department of Chemistry, University of Eastern Finland, Yliopistokatu 7, 80101, Joensuu, Finland.
  • Su BK; Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan.
  • Cheng YH; Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan.
  • Liu ZY; Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan.
  • Khan NM; Department of Chemistry, University of Eastern Finland, Yliopistokatu 7, 80101, Joensuu, Finland.
  • Karttunen AJ; Department of Chemistry and Materials Science, Aalto-University, 00076, Aalto, Finland.
  • Chou PT; Department of Chemistry, National Taiwan University, Taipei, 106, Taiwan.
  • Koshevoy IO; Department of Chemistry, University of Eastern Finland, Yliopistokatu 7, 80101, Joensuu, Finland.
Angew Chem Int Ed Engl ; 61(19): e202115690, 2022 May 02.
Article em En | MEDLINE | ID: mdl-35146862
In the emerging field of intramolecular charge transfer induced counterion migration, we report the new insights into photophysical features of luminescent donor-acceptor phosphonium dyes (D-π-)n A+ [X- ] (π=-(C6 H4 )x -). The unique connectivity of the phosphorus atom affords multipolar molecules with a variable number of arms and the electronic properties of the acceptor group. In the ion-paired form, the transition from dipolar to quadrupolar configuration enhances the low energy migration-induced band by providing the additional pathways for anion motion. The multipolar architecture, adjustable lengths of the π-spacers and the nature of counterions allow for efficient tuning of the emission and achieving nearly pure white light with quantum yields around 30 %. The methyl substituent at the phosphorus atom reduces the rate of ion migration and suppresses the red shifted bands, simultaneously improving total emission intensity. The results unveil the harnessing of the multiple emission of phosphonium fluorophores by anion migration via structure and branching of donor-acceptor arms.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2022 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2022 Tipo de documento: Article